The Grunion fish

The Grunion fish of Californian beaches lays it’s eggs on land at high-tide on a full moon night, so that they get exactly the right interval of two weeks to incubate in the sand before the next extra high tide pops the eggs and washes the young fry out into the sea.

Designed, or trial and error?

I would suggest that the Grunion was given it’s tide tables and knowledge by God the great Designer.